mirror of
https://github.com/kubernetes-sigs/external-dns.git
synced 2025-10-26 08:11:26 +01:00
289 lines
9.2 KiB
Go
289 lines
9.2 KiB
Go
/*
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Copyright 2020 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package source
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import (
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"context"
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"fmt"
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"sort"
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"text/template"
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"github.com/pkg/errors"
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projectcontour "github.com/projectcontour/contour/apis/projectcontour/v1"
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log "github.com/sirupsen/logrus"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
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"k8s.io/apimachinery/pkg/labels"
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"k8s.io/client-go/dynamic"
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"k8s.io/client-go/dynamic/dynamicinformer"
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"k8s.io/client-go/informers"
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"k8s.io/client-go/tools/cache"
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"sigs.k8s.io/external-dns/endpoint"
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)
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// HTTPProxySource is an implementation of Source for ProjectContour HTTPProxy objects.
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// The HTTPProxy implementation uses the spec.virtualHost.fqdn value for the hostname.
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// Use targetAnnotationKey to explicitly set Endpoint.
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type httpProxySource struct {
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dynamicKubeClient dynamic.Interface
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namespace string
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annotationFilter string
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fqdnTemplate *template.Template
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combineFQDNAnnotation bool
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ignoreHostnameAnnotation bool
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httpProxyInformer informers.GenericInformer
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unstructuredConverter *UnstructuredConverter
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}
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// NewContourHTTPProxySource creates a new contourHTTPProxySource with the given config.
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func NewContourHTTPProxySource(
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ctx context.Context,
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dynamicKubeClient dynamic.Interface,
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namespace string,
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annotationFilter string,
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fqdnTemplate string,
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combineFqdnAnnotation bool,
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ignoreHostnameAnnotation bool,
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) (Source, error) {
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tmpl, err := parseTemplate(fqdnTemplate)
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if err != nil {
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return nil, err
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}
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// Use shared informer to listen for add/update/delete of HTTPProxys in the specified namespace.
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// Set resync period to 0, to prevent processing when nothing has changed.
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informerFactory := dynamicinformer.NewFilteredDynamicSharedInformerFactory(dynamicKubeClient, 0, namespace, nil)
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httpProxyInformer := informerFactory.ForResource(projectcontour.HTTPProxyGVR)
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// Add default resource event handlers to properly initialize informer.
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httpProxyInformer.Informer().AddEventHandler(
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cache.ResourceEventHandlerFuncs{
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AddFunc: func(obj interface{}) {
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},
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},
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)
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informerFactory.Start(ctx.Done())
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// wait for the local cache to be populated.
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if err := waitForDynamicCacheSync(context.Background(), informerFactory); err != nil {
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return nil, err
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}
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uc, err := NewUnstructuredConverter()
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if err != nil {
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return nil, errors.Wrap(err, "failed to setup Unstructured Converter")
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}
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return &httpProxySource{
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dynamicKubeClient: dynamicKubeClient,
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namespace: namespace,
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annotationFilter: annotationFilter,
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fqdnTemplate: tmpl,
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combineFQDNAnnotation: combineFqdnAnnotation,
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ignoreHostnameAnnotation: ignoreHostnameAnnotation,
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httpProxyInformer: httpProxyInformer,
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unstructuredConverter: uc,
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}, nil
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}
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// Endpoints returns endpoint objects for each host-target combination that should be processed.
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// Retrieves all HTTPProxy resources in the source's namespace(s).
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func (sc *httpProxySource) Endpoints(ctx context.Context) ([]*endpoint.Endpoint, error) {
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hps, err := sc.httpProxyInformer.Lister().ByNamespace(sc.namespace).List(labels.Everything())
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if err != nil {
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return nil, err
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}
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// Convert to []*projectcontour.HTTPProxy
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var httpProxies []*projectcontour.HTTPProxy
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for _, hp := range hps {
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unstructuredHP, ok := hp.(*unstructured.Unstructured)
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if !ok {
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return nil, errors.New("could not convert")
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}
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hpConverted := &projectcontour.HTTPProxy{}
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err := sc.unstructuredConverter.scheme.Convert(unstructuredHP, hpConverted, nil)
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if err != nil {
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return nil, errors.Wrap(err, "failed to convert to HTTPProxy")
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}
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httpProxies = append(httpProxies, hpConverted)
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}
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httpProxies, err = sc.filterByAnnotations(httpProxies)
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if err != nil {
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return nil, errors.Wrap(err, "failed to filter HTTPProxies")
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}
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endpoints := []*endpoint.Endpoint{}
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for _, hp := range httpProxies {
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// Check controller annotation to see if we are responsible.
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controller, ok := hp.Annotations[controllerAnnotationKey]
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if ok && controller != controllerAnnotationValue {
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log.Debugf("Skipping HTTPProxy %s/%s because controller value does not match, found: %s, required: %s",
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hp.Namespace, hp.Name, controller, controllerAnnotationValue)
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continue
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}
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hpEndpoints, err := sc.endpointsFromHTTPProxy(hp)
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if err != nil {
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return nil, errors.Wrap(err, "failed to get endpoints from HTTPProxy")
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}
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// apply template if fqdn is missing on HTTPProxy
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if (sc.combineFQDNAnnotation || len(hpEndpoints) == 0) && sc.fqdnTemplate != nil {
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tmplEndpoints, err := sc.endpointsFromTemplate(hp)
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if err != nil {
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return nil, errors.Wrap(err, "failed to get endpoints from template")
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}
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if sc.combineFQDNAnnotation {
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hpEndpoints = append(hpEndpoints, tmplEndpoints...)
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} else {
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hpEndpoints = tmplEndpoints
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}
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}
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if len(hpEndpoints) == 0 {
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log.Debugf("No endpoints could be generated from HTTPProxy %s/%s", hp.Namespace, hp.Name)
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continue
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}
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log.Debugf("Endpoints generated from HTTPProxy: %s/%s: %v", hp.Namespace, hp.Name, hpEndpoints)
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endpoints = append(endpoints, hpEndpoints...)
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}
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for _, ep := range endpoints {
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sort.Sort(ep.Targets)
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}
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return endpoints, nil
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}
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func (sc *httpProxySource) endpointsFromTemplate(httpProxy *projectcontour.HTTPProxy) ([]*endpoint.Endpoint, error) {
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hostnames, err := execTemplate(sc.fqdnTemplate, httpProxy)
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if err != nil {
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return nil, err
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}
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resource := fmt.Sprintf("HTTPProxy/%s/%s", httpProxy.Namespace, httpProxy.Name)
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ttl := getTTLFromAnnotations(httpProxy.Annotations, resource)
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targets := getTargetsFromTargetAnnotation(httpProxy.Annotations)
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if len(targets) == 0 {
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for _, lb := range httpProxy.Status.LoadBalancer.Ingress {
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if lb.IP != "" {
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targets = append(targets, lb.IP)
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}
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if lb.Hostname != "" {
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targets = append(targets, lb.Hostname)
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}
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}
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}
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providerSpecific, setIdentifier := getProviderSpecificAnnotations(httpProxy.Annotations)
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var endpoints []*endpoint.Endpoint
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for _, hostname := range hostnames {
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endpoints = append(endpoints, endpointsForHostname(hostname, targets, ttl, providerSpecific, setIdentifier, resource)...)
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}
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return endpoints, nil
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}
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// filterByAnnotations filters a list of configs by a given annotation selector.
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func (sc *httpProxySource) filterByAnnotations(httpProxies []*projectcontour.HTTPProxy) ([]*projectcontour.HTTPProxy, error) {
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labelSelector, err := metav1.ParseToLabelSelector(sc.annotationFilter)
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if err != nil {
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return nil, err
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}
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selector, err := metav1.LabelSelectorAsSelector(labelSelector)
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if err != nil {
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return nil, err
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}
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// empty filter returns original list
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if selector.Empty() {
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return httpProxies, nil
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}
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filteredList := []*projectcontour.HTTPProxy{}
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for _, httpProxy := range httpProxies {
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// convert the HTTPProxy's annotations to an equivalent label selector
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annotations := labels.Set(httpProxy.Annotations)
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// include HTTPProxy if its annotations match the selector
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if selector.Matches(annotations) {
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filteredList = append(filteredList, httpProxy)
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}
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}
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return filteredList, nil
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}
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// endpointsFromHTTPProxyConfig extracts the endpoints from a Contour HTTPProxy object
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func (sc *httpProxySource) endpointsFromHTTPProxy(httpProxy *projectcontour.HTTPProxy) ([]*endpoint.Endpoint, error) {
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resource := fmt.Sprintf("HTTPProxy/%s/%s", httpProxy.Namespace, httpProxy.Name)
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ttl := getTTLFromAnnotations(httpProxy.Annotations, resource)
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targets := getTargetsFromTargetAnnotation(httpProxy.Annotations)
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if len(targets) == 0 {
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for _, lb := range httpProxy.Status.LoadBalancer.Ingress {
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if lb.IP != "" {
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targets = append(targets, lb.IP)
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}
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if lb.Hostname != "" {
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targets = append(targets, lb.Hostname)
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}
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}
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}
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providerSpecific, setIdentifier := getProviderSpecificAnnotations(httpProxy.Annotations)
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var endpoints []*endpoint.Endpoint
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if virtualHost := httpProxy.Spec.VirtualHost; virtualHost != nil {
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if fqdn := virtualHost.Fqdn; fqdn != "" {
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endpoints = append(endpoints, endpointsForHostname(fqdn, targets, ttl, providerSpecific, setIdentifier, resource)...)
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}
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}
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// Skip endpoints if we do not want entries from annotations
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if !sc.ignoreHostnameAnnotation {
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hostnameList := getHostnamesFromAnnotations(httpProxy.Annotations)
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for _, hostname := range hostnameList {
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endpoints = append(endpoints, endpointsForHostname(hostname, targets, ttl, providerSpecific, setIdentifier, resource)...)
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}
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}
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return endpoints, nil
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}
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func (sc *httpProxySource) AddEventHandler(ctx context.Context, handler func()) {
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log.Debug("Adding event handler for httpproxy")
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// Right now there is no way to remove event handler from informer, see:
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// https://github.com/kubernetes/kubernetes/issues/79610
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sc.httpProxyInformer.Informer().AddEventHandler(eventHandlerFunc(handler))
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}
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